2 October 2017 Wavelength-coded volume holographic imaging endoscope for multidepth imaging
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A wavelength-coded volume holographic imaging (WC-VHI) endoscope system capable of simultaneous multifocal imaging is presented. The system images light from two depths separated by 100  μm in a tissue sample by using axial chromatic dispersion of a gradient index probe in combination with two light-emitting diode sources and a multiplexed volume hologram to separate the images. This system is different from previous VHI systems in that it uses planar multiplexed gratings and does not require curved holographic gratings. This results in improved lateral imaging resolution from 228.1 to 322.5  lp/mm. This letter describes the design and fabrication of the WC-VHI endoscope and experimental images of hard and soft resolution targets and biological tissue samples to illustrate the performance properties.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Isela D. Howlett, Isela D. Howlett, Wanglei Han, Wanglei Han, Photini Rice, Photini Rice, Jennifer K. Barton, Jennifer K. Barton, Raymond K. Kostuk, Raymond K. Kostuk, } "Wavelength-coded volume holographic imaging endoscope for multidepth imaging," Journal of Biomedical Optics 22(10), 100501 (2 October 2017). https://doi.org/10.1117/1.JBO.22.10.100501 . Submission: Received: 5 July 2017; Accepted: 13 September 2017
Received: 5 July 2017; Accepted: 13 September 2017; Published: 2 October 2017

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